Three-dimensional geomechanical model of the Tashtagol iron-ore deposit

Conclusion The diverse information collected during fulfillment of the present study on the Tashtagol deposit as a geomechanical entity on the local level, and also the procedure developed for numerical modeling make it possible to perform a detailed analysis of the geomechanical situation that develops near mining operations and in the adjacent mass. The constructed model is “open” for the introduction of additional information on stress fields, the number, location, and state of faults, and other geomechanical information, and is also easily adapted for solution of dynamic (for example, on blast-induced breaking) problems. Similar models may be constructed for all iron-ore deposits of the Gornoi Shorii. The authors express appreciation to A. A. Eremenko, O. V. Kuchai, V. F. Khramtsov, and V. A. Shalaurov for data and information that they submitted on the structure and stress-state of the Tashtagol deposit. The study was performed with financial support of the Russian Fund for Fundamental Research (Grant No. 95-05-15604). Mining Institute, Siberian Division of the Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh. No. 3, pp. 28–37, May–June, 1998.     

Investigation of stress fields occurred in the block caving process at a diasporite deposit in Western Turkey

The modeling with the finite element method was employed to study the block caving process for mining the Milas diasporite deposit in Western Turkey. The stress distribution in the vicinity of production and haulage levels is evaluated applying an elasto-plastic rock mass model. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 63–71, November–December, 2005.     

Modeling of the discharge of free-flowing materials from hoppers

The possibility is substantiated for modeling gravitational flow of free-flowing bulk materials during discharge. Parameters are determined which provide dynamic similarity of the model to real conditions that are confirmed by experiment. Institute of Mining, Siberian Branch Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 66–74, July–August, 1999.     

Modeling complex air-gas-heat dynamic processes in a mine

The paper presents the methods for the numerical modeling of complex air-gas-heat dynamic processes that take place in underground mines. It is shown that modeling the condensate moisture migration, air movement due natural draft as well as heat and smoke propagation during fire may be based upon the earlier developed conjugate model of heat exchange between mine air and a rock mass. The qualitative and quantitative analysis of the effect exerted by thermal compressions of air in shafts on the air movement in mines is performed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 105–111, November–December, 2008.     

Influence of local heterogeneities on discharge channel trajectory at electric pulse destruction of materials

A stochastically deterministic model of electric discharge development in nonuniform dielectrics is proposed. The results of computer modeling and experimental studies of discharge channel orientation are presented. Scientific-Research Institute of High Pressures at Tomsk Polytechnic University, Tomsk, Russia. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 81–87, May–June, 2000.     

Basis of borehole radiometric defectoscopy for rocks. Part II. Physical modeling

Conclusions We have shown that the distance between cracks can be determined from the distance between the maxima of radiometric logs. With a reduction in probe base there is an increase in the absolute maximum of the anomaly I_γmax with a simultaneous reduction in its width. The width of the maximum I_γmax of the anomaly equals the sum of the probe base and crack opening lengths. Physical and mathematical modeling demonstrates the identical qualitative dependence of recorded γ-radiation on crack parameters. However, in arranging problems of mathematical modeling it is necessary to carry out a laboratory experiment previously with the aim of eliminating unmonitored parameters. The possibility has been demonstrated of using hypotheses 1–4, which lie at the base of a theory for borehole geophysical defectoscopy, for interpreting gamma-gamma ray logging data. Institute of Mining, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 35–40, September–October, 1990.     

Deformation of a rock mass during excavation of a flat sheet-like hard mineral deposit

The analytical dependences to describe the shape of a subsidence trough of the earth’s surface under the action of underground mining of a flat sheet-like deposit are constructed by the numerical modeling data. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 3–24, July–August, 2007.     

Sizing room and pillar by numerical modeling for underground marble quarries in Turkey

Optimal parameters of room-and-pillar mining have been established by numerical modeling based on in-situ data on topography, geological structure and physico-mechanical properties for three marble quarries in Turkey. Vertical stresses in pillars are estimated and rock stability classification is developed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 83–89, September–October, 2006.     

Reequipment and development of mining method at Zapolyarny Mine

The mining conditions in Yuzhny district of Zapolyarny Mine are reported. The alternative mining technologies for the additionally explored mine field are considered. The results of modeling and evaluation of stress-strain state in rocks under mining by the discussed mining technologies are cited. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 84–94, May–June, 2007.     

Mathematical model of interaction between the localization system of an underground pneumatic drift punch and a long pipeline

The paper illustrates the influence exerted by underground pipelines on the efficiency of localization system of a pneumatic drift punch. The authors offer an assessment method for the receiver input power by friendly signal refection from an infinite conductive pipeline. The FEM modeling is performed for a directivity pattern of IP4603 pneumodrift punch and a parallel located pipe with the set diameter in the horizontal working plane of the punch. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 25–30, May–June, 2009.     

Geomechanical aspects of the genesis of exo-and endokarst

The paper gives grounds for the hypothesis that the existing kinds of karst are of the same nature that relates to evolution of a rock mass in the zones where endogenous ring-type structure emerge. A comparison is performed between the results of physical and numerical modeling of the karst generation and the in situ data. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 10–20, March–April, 2007.     

Estimate of the rock mass stress state in the course of mining the reserves subjacent the open pit bottom at the “Udachnaya” pipe

Using the mathematical modeling approach, the rock mass stress state is analyzed in the case of the open pit and underground mining of ore reserves of the “Udachnaya” pipe, the stability of the open pit walls and possible failure of the host rocks in the area of second working are estimated. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 25–35, July–August, 2007.     

To the calculation of pillar stability under condition of chamber mining

It is established by mathematical modeling that the loading rate of an interchamber pillar agrees with the maximal relative shear stress intensity reached over each vertical section of the pillar. This correlation is used to find the corrective coefficient for the loading rate of pillars in the inclined strata and for the intermediate pillars in the stopes. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 11–20, January–February, 2007.     

Strain state of a rock mass above karst cavities

The reported data confirm applicability of the discrete element method to modeling numerically evolution of the strain state of a rock mass in the vicinity of karst cavities. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 3–12, November–December, 2008.     

Application of laser scanning for developing a 3D digital model of an open-pit side surface

A method is described for the 3D survey of an open-pit side surface by using a laser scanner in order to develop a 3D digital model for identification of the hierarchical structure of geoblocks at a limestone deposit. The main principles of the laser scanning are explained, recommendations are given for the selection of the scan stations arrangement to survey a vertical open-pit side. The computer-aided scanning-data processing technique is presented for the graphical-analytical representation and system analysis of the experimental geomechanical information on the real rock mass. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 102–112, September–October, 2007.     

Modeling of Area-End Ore Drawing under Caved Rocks

The results of modeling the technology of area-end ore drawing under caved rocks are adduced. The advantages of the new method over the end ore drawing are shown. A method of calculating losses and impoverishment depending on sublevel and breaking parameters as well as on ore drawing mode is presented. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 50–61, September–October, 2005.     

Calculation of the formation processes of underground cavities by blasting method

Computer modeling is performed for underground explosions in soft soils. Features of cavity formation are studied with different blasting schemes for two spherical charges. It is shown that charges distributed in space and with simultaneous action are the most effective for constructing underground storages of the magazine type in clay soils. The S. I. Subbotin Institute of Geophysics, National Academy of Sciences, Kiev, Ukraine. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 45–53, March–April, 2000.     

Modeling failure of geomaterials around a hole under internal pressure

The paper presents the deformation measurement procedure for granular materials by using step-by-step shooting of surface of a sample and the computer-aided data processing in the course of loading. Based on the procedure, the results of laboratory modeling of plastic flow and failure around a hole under internal pressure are considered. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 3–9, March–April, 2007.     

Mine stability with application of sublevel caving schemes

The paper expounds results gained in mathematical modeling of stress state of a rock mass under mining by sublevel caving with areal-frontal and frontal ore drawing schemes. Stability of underground excavations in the course of applying the compared methods is evaluated in terms of the Sheregesh deposit. The authors recommend on supporting the openings at the ore drawing-off level. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 1, pp. 90–100, January–February, 2008.     

Geomechanical substantiation of access roads and stope faces in upward mining of the reserves subjacent the open pit bottom in terms of the mine “Aikhal”

Based on the numerical modeling results, the authors have revealed the features of stress state in the vicinity of development and stope workings in the course of the upward slice chamber-and-pillar mining under the open pit bottom in terms of the mine “Aikhal”. The optimal layout of access entries and their mining sequence in a layer are substantiated. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 47–55, March–April, 2008.